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. 2016 Jun 15;6:27579. doi: 10.1038/srep27579

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a–d) Direct comparison of microstructural features of modern (a) and fossil (b–d) aragonite skeletons of Acropora showing evidence of continuous growth of shingles. Shown are ultra-thin transverse sections (polarized transmitted light, crossed Nicols) of: (a) extant A. muricata (ZPAL H.25/90(535B)), (b) Miocene (Burdigalian) Acropora exerata (ZPAL H.27/28(C56)), (c) Miocene (Aquitanian) Acropora sp. (ZPAL H.27/23(C54)); (d) Middle Eocene Acropora alvarezi (ZPAL H.27/18(C100)), (e) regular incremental growth lines (yellow arrows) in shingled thickening deposits in Miocene (Aquitanian) Acropora sp. (ZPAL H.27/23(C54).